View Compilation Error

0_0_26542496_16265.cpp: In function 'void extend_gcd(int, int, int&, int&, int&)':
0_0_26542496_16265.cpp:10:33: error: 'Extend_gcd' was not declared in this scope
     else{ Extend_gcd(b,a%b,d,y,x); y -= x*(a/b);}
                                 ^